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How do you know if the website is hosted on Linux platform ?and how to hide Operating System Identity

One expert advise me If attacker or hacker got the Remote Operating system platform information and if there are any known vulnerabilities available in the remote operating system then this will help attacker or hacker to steal or hack your website data.
Asking me to hide Operating System Identity .
How do you know if the website is hosted on Linux platform or other?and how to hide Operating System Identity

If the underlying OS isn't explicitly published by the WebServer, there are sometimes clues if you scan the server for ports and see what else is responding (eg, if it also hosts SMTP, that usually says what it is when you connect to it.)

To be protected, you need to scan the address and see what information is available, and close any ports/services that are not being used.

If an attacker knows the OS, that only helps them know what sort of attack to mount.
If you have sufficiently valuable data, they will attack everything and knowing the OS only saves them a bit of time (but may help discourage casual attackers).

So worry less about revealing the OS and worry more about closing anything that is vulnerable.

If you don't own/control the server, this may be harder. If security is important, then your own server and an external audit to see where it is vulnerable may be worth the cost.